Mechanical characterization of hotplate synthesized vanadium oxide nanobelts

作者：Zhu Yanwu; Zhang Yousheng; Dai Ling; Cheong Fook Chiong; Tan Vincent; Sow Chorng Haur^*; Lim Chwee Teck

来源：Acta Materialia, 2010, 58(2): 415-420.

DOI：10.1016/j.actamat.2009.09.018

• Vanadium oxide
• Nanobelts
• Young'
• s modulus
• Structure characterization

Vanadium oxide nanobelts have been synthesized on Si or SiN substrates by simply heating vanadium foils on a hotplate. As-grown nanobelts were characterized as V(2)O(5)center dot nH(2)O (0-3 < n < 1.7) layer structures containing water molecular intercalation. Using an electromechanical resonance method, the Young';s modulus of the nanobelts was measured in situ in a scanning electron microscope. It was found that the Young';s modulus of as-grown nanobelts varied between 5.6 and 98 GPa, with a typical Q-factor of 120. Such scattered values were attributed to the different contents of water molecules in the nanobelts. After annealing at 450 degrees C in vacuum, the nanobelts were converted to alpha-V(2)O(5) phase and a polycrystalline structure was observed. The Young';s modulus of the annealed nanobelts showed more consistent values at an average of 28.9 GPa, lower than the calculated modulus of bulk alpha-V(2)O(5) at 68 GPa.

• 出版日期2010-1